what does it mean if my Honda Accord has a P0455 code

Learn how to diagnose and fix P0455 large leak in the EVAP system of Honda Accord. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace the Gas Cap

• Tools Required: None
• Remove the gas cap and inspect for damage.
• If cracked or damaged, replace it with a new OEM gas cap.

3. Inspect EVAP Hoses and Connections

• Tools Required: Pliers, flashlight
• Follow the EVAP system lines from the fuel tank to the engine compartment.
• Look for cracks or loose connections. Replace any damaged hoses with OEM parts.

4. Check the EVAP Canister

• Tools Required: Socket set, torque wrench
• Locate the EVAP canister (usually under the vehicle near the fuel tank).
• Inspect for cracks or loose fittings. Replace if necessary.

5. Test the Purge and Vent Valves

• Tools Required: Multimeter
• Disconnect the electrical connectors from both the purge and vent valves.
• Test the resistance of each valve according to the manufacturer's specifications.
• Replace any valves that are out of specification.

6. Clear the Code

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0455 code.
• Perform a short test drive to ensure the check engine light does not reappear.